Last week, I got my X3 up and running with the 3 cals ID sent to me and WOW! Their mild street tune allowed me to really smoke the l tires and accelerate hard. My bud with a Duramax was very impressed with the response. After having some high performance fun for a day or two, I put the Econo Cal on my truck and after 200 miles, my fuel mileage went up from 13.45 MPG to 16.1 MPG (hand calculated)! And the truck is absolutely stock! Think I will go back to street cal and see what the MPG is for this one as well. Saving the Tow tune for later this month for a camping trip.

Only issue I have it's the truck tendency to "lope" when it starts cold; sounds like the old Cat engines when they start cold. Is there anything wrong here or should I step down slightly on the skinny pedal after it lights off?

I think the loping is pretty standard when cold due to the injection timing. My Spartan ASE tune does the same thing when I first start it, but after the first lope it doesn't do it any more. If you aren't running a 5w40 synthetic that will help it run smoother when cold as well.

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